NIBCO 2 in. PVC DWV Trap Adapter Fitting C48017HD2 - The Home Depot
Charlotte Pipe 2 in. x 1-1/2 in. PVC Schedule 40 MPT x S Male Reducer Adapter PVC021101600HD - The Home Depot
Drain Pipe Adapter, White PVC, 1.5-In. | True Value
Drain Line Adapter (DLA) with 1/4-inch Quick Connect Fitting for Reverse Osmosis filter (ET112-001, 12-25QC, DLA-12) - Amazon.com
Amazon.com: French Drain Man 4" Corrugated Pipe Adapter (4” Corrugated to 4" PVC) PVC Fittings, PVC Couplings, Corrugated to PVC, Connect Corrugated Pipe to Pop Up Emitter : Industrial & Scientific